package com.imooc.utils;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * cookie工具类
 * @author Create By Liuqz
 * @date 2018/6/9 15:47
 */
public class CookieUtil {

    public static void set(HttpServletResponse response,
                           String name,String value,int maxAge){
        Cookie cookie = new Cookie(name,value);
        cookie.setPath("/");
        cookie.setMaxAge(maxAge);
        response.addCookie(cookie);
    }

    public static Cookie get(HttpServletRequest request,
                           String name){
        Map<String,Cookie> cookieMap = readCookieMap(request);
        if (cookieMap.containsKey(name)){
            return cookieMap.get(name);
        } else {
            return null;
        }
    }

    /**
     * 将Cookie封装成map
     * @param request
     * @return
     */
    private static Map<String,Cookie> readCookieMap(HttpServletRequest request){
        Map<String,Cookie> cookieMap = new HashMap<>();
        Cookie[] cookies = request.getCookies();
        if (cookies == null) {
            for (Cookie cookie : cookies
                    ) {
                cookieMap.put(cookie.getName(), cookie);
            }
        }
        return cookieMap;
    }
}
